Solar power generation system: an effective solution to the problem of power supply

Electricity is an indispensable resource in modern life. Usually, we take it for granted that electricity can be obtained anytime and anywhere. However, a large number of people in today's world live in a world without electricity. They live in poor or remote areas and are far away from power plants and public power grids because there is no electricity, They can't enjoy the information and convenience that modern civilization brings to life.

Solar power generation system can solve their basic power consumption problems. Solar power generation system is mainly composed of inverter, solar module, battery and solar controller. After the solar module is connected to the solar controller, the inverter converts DC into AC to meet the user's load first, and then stores the excess power in the battery for use at night and rainy days. When the battery is dead, the inverter can also support the municipal power or diesel generator as supplementary energy to supply power to the load.

Inverter selection: determine the inverter power according to the user's load size and type

The selection of inverter power is generally not less than the total load power. However, considering the service life and subsequent capacity expansion of the inverter, it is recommended that a certain capacity should be reserved for the inverter power, which is generally 1.2-1.5 times of the load power. In addition, if the load contains similar to refrigerators, air conditioners, water pumps For inductive loads with motors such as range hoods (the starting power of the motor is 3-5 times the rated power), the starting power of the load needs to be taken into account, that is, the starting power of the load should be less than the maximum impact power of the inverter.

Determination of solar module capacity: determine the module capacity according to the user's daily power consumption and light intensity

Part of the electricity generated by the solar module during the day is supplied to the load, and the rest is charged to the battery. At night or when the solar radiation is insufficient, the electricity stored in the battery will be discharged to the load for use. It can be seen that when there is no mains power or diesel engine as supplementary energy, all the electricity consumed by the load comes from the electricity generated by the solar module during the day, Considering the difference of light intensity in different seasons and regions, in order to ensure the reliable operation of the system, the capacity design of solar panel should meet the demand in the season with the worst light.

Determination of battery capacity: determine the battery capacity according to the power consumption at night or backup time

The battery of solar power generation system is mainly used for energy storage to ensure that the load can work normally when the solar radiation is insufficient. For the solar power generation system with important load, the design of battery capacity needs to consider the longest local rainy days. The load power supply requirements of ordinary solar power generation system are not high. Considering the system cost, the number of rainy days can not be considered, but the use of load can be adjusted according to the actual light intensity.

Selection of solar controller: according to conversion efficiency or cost

PWM solar controller has mature technology, simple and reliable circuit and low price, but the utilization rate of components is low, and the utilization rate of components is about 80%. MPPT solar controller refers to the solar controller with maximum power point tracking function. There is a buck buck circuit between the module and the battery, and the utilization rate of the module is more than 90%.

Application fields:

It is widely used in household, transportation, communication, meteorology, photovoltaic power station and other application fields.